rfc:improve_predictable_prng_random

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rfc:improve_predictable_prng_random [2017/02/03 05:22] – Add reseed logic yohgakirfc:improve_predictable_prng_random [2017/09/22 13:28] – external edit 127.0.0.1
Line 136: Line 136:
       if ($this->reseed && !($this->count % $this->reseed)) {       if ($this->reseed && !($this->count % $this->reseed)) {
         $this->seed();         $this->seed();
 +        $this->count = 1;
       }       }
     }     }
Line 218: Line 219:
 </code> </code>
  
-uint32_t BG(mt_rand_is_seeded) is used for already seeded flag and counter. Upper 16 bits are used for seeded flag, lower 16 bits are used for counters. Therefore, max reseed count is 2^16.+uint32_t BG(mt_rand_is_seeded) is used for already seeded flag and counter. MSB is used for seeded flag, the rest bits are used for counters. Therefore, max reseed count is 2^31.
  
  
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 mt_srand()/srand() returned nothing previously. mt_srand()/srand() returned nothing previously.
  
-If users want static random values, they have to use RandomStatus object to get it. Use of mt_srand()/srand() would be rare in general.+If users want static random values, they have to use Random object to get certain random sequence. i.e. Call mt_srand()/srand() for Random object, then use it with functions, rand()/mt_rand()/shuffle()/etc. Use of mt_srand()/srand() would be rare in general.
  
 ===== Proposed PHP Version(s) ===== ===== Proposed PHP Version(s) =====
rfc/improve_predictable_prng_random.txt · Last modified: 2018/03/01 23:13 by carusogabriel

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